Boiler-cleaning device.



Al THOMAS L E. THOMPSON.

BOILER CLEANING DEVIGE.

APPLIO'ATION FILED MAY 15, 190B.

917,380. Patented Apr. 6, 1909.

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"tous A. THOMAS & E. THOMPSON.

EOILEE CLEANING DEVICE.

APPLICATION FILED MAY 15, 1908.

917,380. Patented Apr. 6, 1909.

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ADOLPH THOMAS AND EDGOR THOMPSON, OF MINNESOTA LAKE, MINNESOTA; SAIDTHOMAS ASSIGNOR TO NORBERT THOMAS, OF WHEATON, MINNESOTA.

BOILER-CLE ANTN G- DE VCE Application filed May 15, 1908.

To all whom it may concern:

Be it known that we, ADOLrn THOMAS and 'Encore THOMPSON, citizens of theUnited States, residing at Minnesota Lake, in the county of Faribaultand State of Minnesota, have invented certain new and usefullmprovements in Boiler-Cleaning Devices, of which the following is aspeciiication, reference being had to the accompanying drawings.

Our invention relates to improvements in devices -for cleaning steamboilers and the like, and more particularly an improved means forremoving the scale and dirt from a boiler while it is under pressure.

The object of the invention is to provide an appliance or device of thischaracter which will be simple, practical, and eflicient.

`With the above and other objects in view, the invention consists of thenovel features of construction and the combination and arrangement ofdevices hereinafter fully described and claimed, and illustrated intheaccompanying drawings, in which- Figure 1 is a vertical sectionalview through a steam boiler illustrating the application of ourinvention thereto; Fig. 2 is a section taken on the plane indicated bythe line 2--2 in Fig. 1 Figs. 3 and Ll are enlarged detail views of theinner and outer pipes, Fig. is a sectional view through the lowerportion of a boiler showing a modified form of our invention mountedtherein; and Fig. 6 is an enlarged sectional view through parts shown inFig. 1.

Referring more particularly to Figs. 1 to d inclusive of the drawings inwhich our invention is shown applied to a steam boiler of thehorizontally disposed cylindrical type, the interior of which is freefrom pipes and stay bolts, 1 denotes the shell of the boiler and 2 and 3denote outer and inner cleaning pipes adapted to be moved over the innersurface of said shell to remove the scale and dirt from the same. Theinner pipe 3 is mounted for rotation within the outer one, which latterextends substantially the length of the boiler and is hung from ahorizontal shaft 4 extending centrally and lonffitudinally through theboiler. rlhe shaft l has one of its ends mounted for rotation in abearing provided with a stufling box 5 arranged in the rear end of theboiler shell and the other end of said shaft is mounted in bearingsprovided with stufling boxes 6, 7 arranged, re-

Specication of Letters Patent.

Patented April 6, 1909.

Serial No. 433,137.

spectively, in elbows 8, 9 located at the ends of a horizontal pipeconsisting of a rotatable section 2() and a stationary section 21through which sections said shaft extends. The two pipe sections 20, 21have their opposing ends united by a stuffing box and the outer orstationary section 21 is supported by a strap or band 23 upon the upperend of a standard or any other suitable support 2e arranged adjacent tothe front end of the boiler. The rotatable section eX- tends through andis rotatably mounted in a bearing pipe or sleeve 25 projecting from thefront end or head of the boiler and provided at its` outer portion witha stufling box 26. The elbow 8 is arranged within the boiler upon theinner end of the section 2O and is connected by a pipe 27 to one end ofthe outer cleaning pipe 2 so that said pipe 27 serves as a hanger forone end of the pipe The other end of the latter is hung from the shaftby a rigid hanger arm 28. The elbow 9 is arranged upon the outer end ofthe rigid pipe section 21 and projecting downwardly from it is adischarge pipe 29 containing a cut oif valve 30 which may be in the formof a rotary plug, as illustrated. ln the outer cleaning pipe 2 is formeda straight slot 31 which extends longitudinally from end to end of saidpipe and in the inner pipe 3, which rotates within the outer one, isformed a spiral slot 32 which extends, preferably, once around saidpipe, as illustrated. By slotting these pipes as set forth, it will beseen that when the pipe 3 is rotated within the pipe 2 the spiral slot32 will be caused to register with tho straight slot 31 at a constantlyadvancing point along the length of said pipe so that the pressurewithin the boiler will force the dirt and scale through the registeringportions of said slots and out through the pipes 27', 20, and 29 whenthe valve 30 is opened. The slot 31 is disposed opposite the inner faceof the boiler shell and is adapted to advance over the saine as the pipe2 is swung about its axis or shaft 4, thereby enabling the entire innersurface of the boiler shell to be effectively cleaned as the pipe 2 isoscillated or revolved and the pipe 3 rotated within it. While anysuitable means may be provided for operating the pipes 2, 3, wepreferably employ that illustrated which comprises a sprocket chain 33passed over sprocket wheels 34, 35 fixed to the shaft 4 and to one endof the inner pipe 3; a crank handle 36 at the front end of the shaft 4and a reducing gear between said. shaft and the rotatable pipe section20. This reducing gear comprises a pinion 37 fixed on the shaft 4 tomesh with the gear 88 on one end of a shaft 39 journaled in bearingsupon the standard 24 and provided at its other end with a pinion 40 tomesh with a gear 41 fixed to the rotatable pipe section 20. It will beseen that when the crank handle 36 is rotated the inner cleaning pipe 3will be rapidly rotated within the outer pipe 2, while the latter willbe slowly revolved within the boiler.

In Fig. 5 of the drawings, we have illustrated another embodiment of ourinvention especially adapted for use in boilers containing stay boltsand pipes which would interfere with the revolution of the outercleaning pipe around the interior surface of the boiler shell. y 1n thisembodiment of our invention, 2a denotes the outer cleaning pipe which isdisposed adjacent to the center' of the bottom of the boiler and has oneof its ends projecting throughv the stuliing box ZotL in which it isrotatably mounted in order to permit its straight longitudinal slot 31ato be turned in any direction by means of a handle 43. The inner pipe 3aof this device is rotatably mounted within the pipe 2a so that itsspiral slot 3l.:L may be caused to intersect the slot 31 a at differentpoints. he outer' end of the inner pipe 3a extends through a stuffingbox 42 and is connected by a stuffing box 22 to a stationary dischargepipe 29l containing a cut off valve 30a. Upon the projecting outer.portion of the pipe 3a is a radially projecting handle 36 by means ofwhich said pipe may be rotated.

From the foregoing, it will be seen that our invention provides anexceedingly simple and practical device for cleaning out boilers andother liquid containers while they are under pressure.

While we have shown and described in detail the preferred embodiments ofour invention we wish it understood that we do not limit ourselves tothe precise showing set forth and that various changes in the form,proportion and minor details of construction may be resorted to withoutdeparting from the spirit or sacrificing any of the advantages of theinvention.

Having thus described our invention what we claim is:

1. In a cleaning device of the character described, the combination withthe shell of a boiler or the like, of inner and outer cleaning pipesarranged within the same and formed with slots adapted to be moved intoand out of register with each other, a shaft, means for hanging theouter pipe from the same, means between said shaft and the inner pipefor rotating the latter within the outer one and means for rotating saidshaft.

shell and connected at its inner end to the outer pipe, drivingconnections between the shaft and the inner pipe, driving connectionsbetween the shaft and said rotatable pipe section, a valve forcontrolling the discharge from the stationary pipe section and means forrotating said shaft.

3. In a cleaning device of the character described, the combination witha shell of a boiler or the like, of inner and outer cleaning pipesarranged within the same and formed with slots adapted to be moved intoand out of register with each other, a shaft, means for hanging theouter pipe from said shaft, an outlet for the outer pipe, means forrotating the shaft and means for rotating the inner p1 3e.

l4. In a cleaning device of the character described the combination witha shell of a boiler or the like, of inner and outer cleaning pipesarranged within the same and formed with slots adapted to be moved intoand out of register' with each other, a shaft, means for hanging theouter pipe from said shaft, an outlet pipe concentric with the shaft andhaving stationary and rotatable sections, the rotatable sectionprojecting through the shell and being connected at its inner end to theouter pipe, means for rotating the rotatable section and means forrotating said inner pipe.v Y

5. in a cleaning device of the character described the combination witha shell of a boiler or the like, of inner and outer cleaning pipesarranged within the sar-ne and formed with slots adapted to be movedinto and out of register with each other, a shaft, means for hanging theouter pipe from said shaft, an outlet pipe concentric with the shaft andhaving stationary and rotatable sections, the rotatable sectionprojecting through the shell and being connected at its inner end to theouter pipe, means for rotating the rotatable section, drivingconnections between the shaft and said inner cleaning pipe and means forrotating said shaft.

6. 1n a cleaning device of the character described the combination witha shell of a boiler or the like, of inner and outer cleaning pipesarranged within the same and formed with slots adapted to be moved intoand out of register with each other, a shaft, means for hanging theouter pipe from said shaft, means between said shaft and the inner pipefor rotating the latter within .the louter one,

an outlet pipe concentric with the shaft and our signatures in thepresence of two Withavlng a stationary section and a 'rotatable nesses.

sectionJ the latter extendin throuwn the J y i shell and being connectedto tiie outeigcleangggnrr 5 ing pipe and means for smuitaneously roltating the shaft and the rotatable section of Witnesses:

the outlet pipe. O. H. SCHROEDER,

In testimony whereof We hereunto aiiix E. COTE.

